Fire escape



Nov. 22, 1932. c. D. DE GRAFFENREID FIRE ESCAPE Filed OCJC. 7, 1929 Patented Nov. 22, 1932 UNITED STATES PATENT OFFICE i FIRE ESCAPE Application led October 7, 1929. Serial No. 397,982.

This invention relates to fire escapes especially adapted for use in connection with the derrick of a well drilling or pumping apparatus, an object being to provide means v whereby a person aloft may quickly and safely descend in the event of fire or other emergency.

Another obj ect of the invention is the provision of means for suspending a car or cage from a derrick together with means for controlling its descent in accordance with weight within the car.

With the above and other objects in view, the invention further includes the following novel features and details of construction, to be hereinafter more fully described, illustrated in the accompanying drawing and pointed out in the appended claim.

In the drawing Figure 1 is a fragmentary elevation showing a portion of a derrick with the invention ap lied.

*igure 2 is mechanism.

Figure 3 is a side elevation partly in section illustrating the governor mechanism and its connection with the cable spool.

Referring to the drawing in detail wherein like characters of reference denote correspending parts, the reference character 10 indicates a portion of a derrick, a part of one of the platforms of the derrick being indicated at 11.

The invention which is designed for attachment to the derrick comprises a frame 12. This frame is secured to and extends laterally from the derrick and carries mechanism by means of which a car or cage 13 may be suspended through the medium of a cable 14. The cable 14 is wound upon a spool 15 and the latter is secured to a vertically disposed shaft 16 which is mounted for rotation in suitable bearings provided in the frame.

Disposed concentrically around the shaft 16 is a brake drum 17 which is rigidly secured to a member 18, in turn secured to the frame 12. The drum 17 is thus stationary with respect to the shaft 16. Located within the drum and adapted to engage the inner periphery thereof are brake shoes 19. These shoes a top plan view of the governor extend from arms 20 which are slidingly mounted within the drum on. guides 21. Normally these shoes are spaced from the inner periphery of the frame and are adapted to be moved into engagement with said drum so as to control rotation of the shaft 16.

For the above purpose, the shaft 16 has slidingly secured thereto a grooved collar 22, and extending from this collar parallel with the shaft 16 are arms 23. Bell crank levers 60 24 are pivotally mounted as shown at 25 and have one of their ends 26 pivotally secured to the inner ends of the arms 23 and their opposite ends pivotally secured to the arms 2() of the brake shoes as shown at 27. Downward 55 or inward movement of the sleeve 22 will thus rock the bell crank levers 24 upon their pivots 25 and move the brake shoes outward to engage the inner periphery of the drum.

Fused upon the shaft 16 is a collar 28, and 70 extending radially from this collar are oppositely disposed substantially L-shaped arms 29. Bell crank levers are pivotally secured to the arms 29 as shown at 30, and the short arms 31 of these levers extend within the groove of the collar 22. The outer arms 32 of these bell crank levers carry weights 33 at their outer ends.

From the foregoing description and accompanying drawing it will be seen that downward movement of the cage 13 will rotate the spool 15 and shaft 16, the speed of rotation governing the position of the weighted bell crank levers, the. weights 33 moving outward proportionate to the speed of the shaft. This j outward movement of the weights will cause the sleeve 22 to move inward and move the brake shoes outward as previously described.

The invention is suceptible of various changes in its form, proportions and minor details of construction and the right is herein reserved to make such changes as properly fall within the scope of the appended claim.

Having described the invention what is claimed is:

In a centrifugal governor, a rectangular frame, a rotatably mounted shaft carried by the frame, a stationary brake drum arranged concentrically about the shaft and secured to the frame, brake shoes mounted for sliding` movement Within the drum, said shoes being normally spaced from and adapted to engage the inner periphery of the drum, substantially L-shaped arms secured to and extending axially from the shaft, a collar rotatably and slidably secured to the shaft, arms extending from the collar parallel with the shaft, pivotally mounted bell crank levers having one of their ends pivotally secured to said arms and their other ends pivotally secured to the brake shoes to move the shoes outward When the collar is moved inward, and Weight carrying bell crank levers pivotally secured to the L-shaped arms and operatively engaging the collar to control the position of the latter Vthrough speed and rotation of the shaft.

In testimony whereof I affix my signature.

CHARLIE D. DE GRAFFENREID. 

